package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());
        //先看这个商品在不在购物车
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list!=null && list.size() > 0){
            //如果存在，数量+1
             shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //不存在，新增数据  number=1

            Long dishId = shoppingCartDTO.getDishId();

            if (dishId!= null){
                //如果是菜品 调用dishMapper 根据 id获取dish 名字、图片、价格
                Dish dish = dishMapper.getById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //如果是套餐 调用setmealMapper 根据 id获取setmeal 名字、图片、价格
                Setmeal setmeal = setmealMapper.selectById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);


        }




    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> getShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }


    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());
        //先看这个商品在不在购物车
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        list.forEach(item -> {
            if (item.getNumber() > 1){
                item.setNumber(item.getNumber() - 1);
                shoppingCartMapper.updateNumberById(item);
            }else {
                shoppingCartMapper.deleteById(item.getId());
            }
        });


    }
}
